Rear sight for a pistol



FIG. 1 is a view in rear perspective showing my design for a rear sight for a pistol, the pistol slide shown in phantom lines forming no part of my design;

FIG. 2 is a view in right side elevation thereof, the pistol slide shown in phantom lines forming no part of my design;

FIG. 3 is a view in left side elevation thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a view in rear elevation thereof; and

FIG. 7 is a view in front elevation thereof. 

The ornamental design for a rear sight for a pistol, as shown and described. 